Soldering gun construction



April 6, 1954 J. L. CALIRI SOLDERING GUN CONSTRUCTION 2 Sheets-Sheet 1 Filed July 20, 1951 INVENTOR.

April 6, 1954 J. L. CALlRl 2,674,680

SOLDERING GUN CONSTRUCTION Filed July 20, 1951 a y N Joseph L. Gal/r1 INVENTOR. r J U 0 BY 0 Q1 M o Patented Apr. 6, 1954 SOLDERING GUN CONSTRUCTION Joseph L. Caliri, Lawrence, Mass., assignor to Caliri Manufacturing Company, Inc., Lawrence, Mass., a corporation of Massachusetts Application July 20, 1951, Serial No. 237,801

1 Claim. 1

This invention relates to new and useful improvements and structural refinements in soldering guns, particularly soldering guns of the coaxial type electrode variety employing a step down transformer for energizing the electrode, and the principal object of the instant invention is to provide an improved transformer structure having primary and secondary windings which may b easily and independently removed from the transformer core, so that the entire transformer or gun need not be discarded when, after a period of use, the primary transformer winding becomes inoperative.

Another feature of the invention resides in the specific coaxial electrode structure and in its structural relationship to the transformer core and the secondary winding.

Some of the advantages of the invention lie in its simplicity of construction, in its dependable operation, and in its adaptability to economical manufacture.

With the above more important objects and features in view, and such other objects and features as may become apparent as this specification proceeds, the invention consists essentially of the arrangement and construction of parts as illustrated in the accompanying drawings, in which:

Figure 1 is a side elevational view of the transformer and electrode structure, the outline of the gun housing being illustrated by dotted lines;

Figure 2 is a top plan View of the subject shown in Figure 1;

Figure 3 is a longitudinal sectional View of the electrode and portion of the transformer;

Figure 4 is a transverse sectional detail, taken substantially in the plane of the line 44 in Figure 3;

Figure 5 a group perspective view of the components shown in Figure 3; and

Figure 6 is a group perspective view illustrating a modified transformer core construction.

Like characters of reference are employed to designate like parts in the specification and throughout the several views.

Referring now to the accompanying drawings in detail, and more particularly to Figures 1-5 inclusive, the reference character In indicates the outlin of a soldering gun housing, containing a step-down transformer assembly 12 to which is operatively connected a coaxial electrode unit It, the latter projecting outwardly from the housing, as indicated.

The transformer assembly l2 comprises an elongated, substantially rectangular core l6, which includes a pair of spaced sid members I8,

20 and end members 22, 24 (see Figure 5). Of course, the transformer core is of the usual laminated construction, and a set of bolts 26, equipped with nuts 28 are employed for connecting the laminated side and. end members of the core together.

It is to be noted that pairs of straps 30 are disposed at the outside of th end members 22, 24 to facilitate connecting the several members together, and if desired, the end members 24 may be formed integrally with the side members 29, while the end members 22 are formed integrally with the side members l8. However, a recess 32 is provided in the end member 22, which recess is in communication with the space between the side members I8, 20.

A secondary transformer winding coil 3 assuming the form of a helical strap, is slidably positioned on the side member l8 of the transformer core, adjacent the recess 32, the end portions of this coil being provided with a pair of screw threaded terminal lugs 36, 38 which are disposed in the space between the side members 18, 20 and are in substantial longitudinal alignment in the recess or opening 32.

A primary winding coil 40 is slidably positioned on the side member l8 of the core between the secondary coil 34 and the other end of the core, that is, between the coil 34 and the end member 30, it being noted that in this manner the transformer core constitutes the sole means of connection between th primary and secondary winding coils. Moreover, it will be observed that by simply removing one of the bolts 26 as is shown in Figure 5, the transformer core may be opened by hingedly spreading the side members It, 28 apart, so that at least one end of the side member if is exposed to permit the primary and secondary coils 40, 34 to be individually and successively removed from the core for purposes of inspection or replacement.

Referring now to the structure of the coaxial electrode unit I4, this embodies a hollow, elon-. gated outer electrode member 50* which preferably consists of a plurality of longitudinally aligned sections 50A, 50B and 500, these sections being separably connected together by engaging screw threads 52 and the section 580 having a closed end affording a work engaging tip 54. The electrode unit [4 extends into the recess or opening 32 in the core l6, and the outer electrode section 50A is provided with a screw threaded end portion 56 which is secured in the terminal lug 36 of the secondary winding coil 34.

The inner member of the electrode is shown at 3 58 and includes a pair of longitudinally aligned sections 58A and 58B, the section 58A having a screw threaded end 60 which is secured in the other terminal lug 38 of the secondary winding coil 34.

A suitable insulating sleeve 62 is positioned between the inner electrode section 58A and the outer electrode section SPA (see Figure 3),, and the innefsectidniBA isprovided with a countersink 64 which functions as a seat for the adjacent end of the inner electrode section 583. The other end of the section 58B engages a countersink 55 provided in the work engaging tip 541 and it will be observed from the foregoing thagt when the outer electrode sections 50Af519andf con-H nected together by tightening the screwothreads 52, axial pressure will the transmittedto the inner electrode sections 58A and 58Bs0' tnartrie latter are in proper electrical contact with each, other and with the work engaging tip 54.

! th at r wese9i a 5. 3 may the ihne'rj electrode'fsection 583 he, whereby, upon condlreq t o he th' 'of the electrode unit may be shortened accordingly." Moreover, by simply removingth outer section 50C from the s k Magingti a .boquiokiv ed, when; necessary.

ustra d hi the accompanying g n ore, It herein, consists priniaril o n in'ations which afford a pair of spac BlIifiill s12, M connected tosome; at an dxn'ember 16,

A'p"ir"of"sti"a sllYare provided at the opposite side of, the side Inern 11312, i i, at the o 'en e d etth f 'let jt 1d he Straps ave, securedfio' th j inner surfaces tli reof a 'set" of" en .larninations Bil.

,cl ,t the straps 18 by an'ir suit ablel me ns, as for example,

The; ninin ti otj a the; larninat ioiisfat the cl sed ,o {a d it will lie apparent fromthe foregoing that jby 'jsirnpl removing the screws 84, thestrapslajtogether with thelaniinations 80 may be readi'lyreriioved; sons to. facilitate installation or removal of the primary and secondarycoils oneitherofthe side ll'ililberSTZ, M.

It is I believed'that the advantages and use of the invention'will be clearly understood from the foregoing disclosure and accordingly, further description thereof at'fthi's point'lis deemed unnec essaryi t n now the niodifiedtransformer While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

Having described the claimed as new is:

In a soldering gun, the combination of a coiled strap affording a path for the secondary circuit invention, what is of a step-down transformer and having a pair of spaced parallel end portions provided with coaxial apertures, a tubular outer electrode memher having oneend portion thereof secured in thetaper ture. ofioneend portion of said strap, a. tubular headrerngvably connected to and constituting a longitudinal continuation of the other endotrsaid outer electrode member and termihating in a closed work-engaging end, a rodshaped inner electrode member secured at oneend' thereof in the aperture of the other end,

portion of said strap and extending axially in said outer member in spaced relation therefrom to a terminal point intermediate the endsv or the outer, member, a tubular insulating sleeve. hav, ing its inner 3 9d outer surfaces in engagement, with the respective innerand outer members and extending from. the end 01 the outer member securedin said strap to.,said terminal point of the innerfmember, and arod-shaped extension having one endrthereo i in abutment with said terminal point of the inner member, all but the otherend of said extension being disposedaxially, in but space'dfradially fromthe outer mam-l her and said head saidotherend of theexten sion being in abutment withthe, work engaging end of e the head, said work-engaging end of said head being provided atthe inside thereof with a conical seat, saidterminal point of, said innermember also'being provided with a conical seat, and said extension havingconical, ends in enment i hhe espe tive a he eb to.

providesolemeans for. sustaining the extensiom in radially spacedrelationfromsaid outer meme r. nd m unas References Cited, in the file of this patent UNI E ATES.- T N Number Name Date 400,972 Thomson Apr. 9, 1889 483,050 Fitzmaurice Sept. 20, 1892- 488,871 Coflin- Dec. 27, 1892 666,162 5 Thomson Jan. 15, 1901 1,555,066 Lines Sept. 29, 1925 1,629,132 Thordarson Q May 17, 1927 2,106,439 Schubert Jan. 25, 1938 2,560,552 Caliri- July 17, 1951 ORE GN AT Number Country Date 595,061 France Sept. 25, 1925 .9 8.. re Bri ain .-V-- S pt., -,,.19e19:- 

